can case
Regular verb: case - cased- cased

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can case
you can case
he can case
we can case
you can case
they can case 	I can be casing
you can be casing
he can be casing
we can be casing
you can be casing
they can be casing	I can have cased
you can have cased
he can have cased
we can have cased
you can have cased
they can have cased	I can have been casing
you can have been casing
he can have been casing
we can have been casing
you can have been casing
they can have been casing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot case
you cannot case
he cannot case
we cannot case
you cannot case
they cannot case 	I cannot be casing
you cannot be casing
he cannot be casing
we cannot be casing
you cannot be casing
they cannot be casing	I cannot have cased
you cannot have cased
he cannot have cased
we cannot have cased
you cannot have cased
they cannot have cased	I cannot have been casing
you cannot have been casing
he cannot have been casing
we cannot have been casing
you cannot have been casing
they cannot have been casing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I case?
can you case?
can he case?
can we case?
can you case?
can they case? 	can I be casing?
can you be casing?
can he be casing?
can we be casing?
can you be casing?
can they be casing? 	can I have cased?
can you have cased?
can he have cased?
can we have cased?
can you have cased?
can they have cased? 	can I have been casing?
can you have been casing?
can he have been casing?
can we have been casing?
can you have been casing?
can they have been casing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not case?
can you not case?
can he not case?
can we not case?
can you not case?
can they not case? 	can I not be casing?
can you not be casing?
can he not be casing?
can we not be casing?
can you not be casing?
can they not be casing? 	can I not have cased?
can you not have cased?
can he not have cased?
can we not have cased?
can you not have cased?
can they not have cased? 	can I not have been casing?
can you not have been casing?
can he not have been casing?
can we not have been casing?
can you not have been casing?
can they not have been casing?